EP1850161B1 - Verfahren zur Montage eines Linsensystems mittels Abstandsvorrichtung - Google Patents

Verfahren zur Montage eines Linsensystems mittels Abstandsvorrichtung Download PDF

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Publication number
EP1850161B1
EP1850161B1 EP07008425A EP07008425A EP1850161B1 EP 1850161 B1 EP1850161 B1 EP 1850161B1 EP 07008425 A EP07008425 A EP 07008425A EP 07008425 A EP07008425 A EP 07008425A EP 1850161 B1 EP1850161 B1 EP 1850161B1
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EP
European Patent Office
Prior art keywords
lens
face
receiving face
opposing
lenses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07008425A
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English (en)
French (fr)
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EP1850161A1 (de
Inventor
Daisuke Ayame
Hiroshi Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
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Fujifilm Corp
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Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Publication of EP1850161A1 publication Critical patent/EP1850161A1/de
Application granted granted Critical
Publication of EP1850161B1 publication Critical patent/EP1850161B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/027—Mountings, adjusting means, or light-tight connections, for optical elements for lenses the lens being in the form of a sphere or ball

Definitions

  • the present invention relates to a lens system assembling method for assembling a lens system by fixing the positions of two mutually opposing lenses such that the spacing between the two lenses is set at a predetermined distance.
  • the invention also relates to a spacing jig used for the lens system assembling method.
  • the objective lens mounted on an endoscope, a microscope, or the like includes a plurality of lenses disposed in a lens barrel.
  • a method for setting the spacing (also referred to as "air-spacing") between the lenses using a cylindrical spacer ring is known as described, for example, in Japanese Unexamined Patent Publication No. 2003-262774 and U.S. Patent Application Publication No. 20040158129 . It is also known that lens setting errors may be within the range from ⁇ 0.01 to 0.02mm by disposing the spacer ring between two lenses and abutting the two lenses to an edge portion of the end faces of the spacer ring.
  • the spacer ring is disposed between two concave lenses
  • the lens faces contact the outer edge portion of the end faces of the spacer ring. Therefore, spacing errors between lenses are mainly dependent on the dimensional accuracy of the spacer ring in the cylinder axis directions and the dimensional accuracy of the inner or outer diameter of the spacer ring.
  • the problems described above are not limited to objective lenses, and common to general lens systems in which the spacing between two mutually opposing lenses is set using the spacer ring.
  • the present invention has been developed in view of the circumstances described above, and it is an object of the present invention to provide a lens system assembling method capable of setting the spacing between two mutually opposing lenses more accurately without increasing the manufacturing cost of the lens system, and a spacing jig used in the lens system assembling method.
  • the lens system assembling method of the present invention is a method as stated in claim 1.
  • the spacing jig for use with the lens system assembling method of the present invention is a spacing jig as stated in claim 2.
  • the opposing lens face of the first lens is the lens face of the first lens disposed on the side towards the second lens
  • the opposing lens face of the second lens is the lens face of the second lens disposed on the side towards the first lens.
  • the referent of "having a shape corresponding to the shape" as used herein may include the case in which the entire shape corresponds with each other, or the case in which a portion of the shape corresponds with each other.
  • the lens face may include a spherical face, a planar face, an aspherical face, or a free-form face.
  • the lens system assembling method described above may be a lens system assembling method in which a spacer ring for setting the spacing between other two mutually opposing lenses, which are different from the mutually opposing two lenses described above, is provided, the spacer ring having an end face shaped to correspond to the shape of at least one of the two mutually opposing lens faces; and setting the spacing between the two lenses by abutting one of the two lenses to the spacer ring such that one of the opposing lens faces is brought into close contact with the end face of the spacer ring having the shape corresponding to the opposing lens face, and abutting the other lens of the two lenses to the other end face of the spacer ring.
  • the spacer ring for use with the lens system assembling method is a spacer ring for use with a lens system assembling method for assembling a lens system by fixing the positions of two mutually opposing lenses such that the spacing between the two lenses is set at a predetermined distance, which has an end face shaped to correspond to the shape of at least one of the two mutually opposing lens faces.
  • the lens assembly is performed by the steps of: holding the first lens with the lens holding member, with the opposing lens face of the first lens being brought into close contact with the first receiving face of the spacing jig, and the lens receiving face of the lens holding member being brought into close contact with the second receiving face of the spacing jig thereby axially aligning the first lens; removing the spacing jig from the first lens and the lens holding member holding the first lens; and abutting the second lens to the lens receiving face of the lens holding member such that the opposing lens face of the second lens is brought into close contact with the lens receiving face.
  • the performance of the lens system may be further enhanced.
  • the spacer ring is incorporated and used in the lens system when assembled, unable to be commonly used for the assembly of other lens systems, so that it is expected to be produced at a low cost.
  • the spacing jig is not incorporated in a lens system, so that a single spacing jig may be commonly used for the assembly of many lens systems.
  • the spacing jig may be readily manufactured with a high degree of accuracy since a low manufacturing cost is not expected for the jig.
  • setting accuracy of the spacing between two lenses using the spacing jig is not influenced by the DR value described above. That is, the spacing may be set with identical accuracy for lenses having shapes close to a hemisphere or to a planar surface. Therefore, according to the lens system assembling method and the spacing jig described above, the spacing between two mutually opposing lenses may be set more accurately in comparison with the conventional method, without increasing the manufacturing cost of the lens system.
  • the lens holding member described above is incorporated in a lens system
  • the setting accuracy of the spacing is mainly determined by the dimensional accuracy of the spacing jig, and is not directly influenced by the dimensional accuracy of the lens holding member. Accordingly, a wider manufacturing tolerance may be used, and hence the lens holding member may be manufactured at a low cost, which does not increase the manufacturing cost of the lens system.
  • Figure 1 is a cross-sectional view of a lens system assembled through a lens system assembling method of the present invention, schematically illustrating the construction thereof.
  • Figure 2 is a cross-sectional view of a spacing jig used in the lens system assembling method, illustrating the cross-section thereof.
  • Figure 3 a cross-sectional view of a lens holding member, illustrating the cross-section thereof.
  • the lens system 100 shown in Figure 1 which is an objective lens to be mounted on the distal end of an endoscope, is assembled using the lens system assembling method of the present invention, in which the positions of two mutually opposing lenses, a first lens 10 and a second lens 20, are set such that the spacing between the two lenses becomes a predetermined distance "h".
  • the lens system assembling method described above uses a spacing jig 50 which includes a first receiving face 51 and a second receiving face 52 formed so as to be oriented towards the same direction spaced apart by the predetermined distance "h".
  • the first receiving face 51 has a shape corresponding to the shape, with a complementary concave/convex pattern, of the opposing lens face 12 of the first lens 10
  • the second receiving face 52 has a shape corresponding to the shape, with the same concave/convex pattern, of the opposing lens face 21 of the second lens 20.
  • the lens system assembling method also uses a lens holding member 60 capable of holding the second lens 20 without blocking light passing through the second lens 20.
  • the lens holding member 60 includes a lens receiving face 61 having a shape corresponding to the shape, with a complementary concave/convex pattern, of the opposing lens face 21 of the second lens 20.
  • the opposing lens face 12 of the first lens 10 is the lens face of the first lens 10 disposed on the side towards the second lens 20.
  • the opposing lens face 21 of the second lens 20 is the lens face of the second lens 20 disposed on the side towards the first lens 10.
  • the central axis of the first lens 10 is designated as C1
  • the central axis of the second lens 20 is designated as C2.
  • Each of the central axes corresponds to each of the optical axes of the lenses. If each of the lens faces forming each of the first and second lenses is spherical, the central axis C1 would pass through the sphere center of each of the lens faces of the first lens 10, and the central axis C2 would pass through the sphere center of each of the lens faces of the second lens 20.
  • the central axis of the spacing jig 50 is designated as J1. If the first receiving face 51 and the second receiving face 52 are lens faces, the central axis J1 would correspond to the optical axis of the spacing jig 50, and if the first receiving face 51 and the second receiving face 52 are spherical, the central axis J1 would pass through the sphere center of the first receiving face 51 and the sphere center of the second receiving face 52.
  • the central axis of the lens holding member 60 having a peripheral receiving face 62 which is orthogonal to the rotation axis 70C of a lens barrel 70, described later, is designated as J2. If the lens receiving face 61 and the peripheral receiving face 62 are lens faces, the central axis J2 corresponds to the optical axis of the lens holding member 60, and if the lens receiving face 61 is spherical and the peripheral receiving face 62 is planar, the central axis J2 is orthogonal to the peripheral receiving face and passes through the sphere center of the lens receiving face 61.
  • the rotation axis 70C corresponds to the optical axis 100C of light beam passing through the lens system 100.
  • Figure 4A is a cross-sectional view, illustrating the spacing jig and the first lens.
  • Figure 4B is a cross-sectional view, illustrating that the opposing lens face of the first lens is brought into close contact with the first receiving face of the spacing jig.
  • Figure 4C is a cross-sectional view, illustrating that the first lens is held by the lens holding member with the opposing lens face of the first lens being kept in contact with the first receiving surface of the jig.
  • Figure 4D is a cross-sectional view, illustrating that the spacing jig is removed with the first lens being held by the lens holding member.
  • Figure 4E is a cross-sectional view, illustrating that the lens holding member holding the first lens is inverted.
  • Figure 4F is a cross-sectional view, illustrating the second lens and lens holding member holding the first lens.
  • Figure 4G is a cross-sectional view, illustrating that the opposing lens face of the second lens is brought into close contact with the lens receiving face of the lens holding member.
  • the opposing lens face 12 of the first lens 10 is brought into close contact with the first receiving face 51 of the spacing jig 50 ( Figures 4A, 4B ).
  • the lens receiving face 61 of the lens holding member 60 is brought into close contact with the second receiving face 52 of the spacing jig 50 ( Figure 4C ).
  • the first lens 10 is held by the lens holding member 60.
  • the first lens 10 and the lens holding member 60 are integrated together by bonding as an example. Note that the abutting faces and fitting faces of each of the members are formed accurately so that the central axes C1, J1, and J2 of the respective members are aligned with each other when the first lens 10 and the lens holding member 60 are integrated together.
  • the spacing jig 50 is removed from the first lens 10 and the lens holding member 60 holding the first lens 10. Then the integrated first lens 10 and the lens holding member 60 are inverted in the vertical directions (arrow Z directions in the drawing), ( Figures 4D, 4E ).
  • the second lens 20 is abutted to the lens receiving face 61 such that the opposing lens face 21 of the second lens 20 is brought into close contact with the lens receiving face 61 of the lens holding member 60 ( Figures 4F, 4G ).
  • This may set the spacing between the first lens 10 and the second lens 20 at the predetermined distance "h". Then, the lens holding member 60 and the second lens 20 are fixed together.
  • the lens holding member 60 and the second lens 20 are bonded together as an example. This may integrate the first lens 10, the second lens 20, and the lens holding member 60 together.
  • each of the members are formed accurately so that the central axes C1, C2, and J2 of the respective members are aligned with each other when the first lens 10, the second lens 20, and the lens holding member 60 are integrated together.
  • the integrated first lens 10, second lens 20, and lens holding member 60 are fixed on the distal end of the lens barrel 70. More specifically, the lens holding member 60 is fixedly bonded to the lens barrel 70 with the peripheral receiving face 62 abutted to an end face 70A of the lens barrel 70, which is orthogonal to the rotation axis 70C of the lens barrel 70 ( Figure 5A ). Note that the central axes C1, C2, and J2 and the rotation axis 70C are aligned with each other when the peripheral receiving face 62 is abutted to the end face 70A of the lens barrel 70.
  • the first lens 10 is the input side of light from an observation target object. That is, the lens that first receives light from an observation target object is the first lens 10 among the lenses included in the lens system 100, and the lens face that first receives the light is the first lens face 11 of the first lens 10.
  • Figure 5A is a cross-sectional view after two lenses, the first and second lenses, are assembled.
  • Figure 5B is a cross-sectional view after five lenses are assembled.
  • Figure 5C is a cross-sectional view after eight lenses are assembled.
  • Figure 5D is a cross-sectional view after all of nine lenses are assembled.
  • One of the end faces of a spacer ring 71 is abutted to a second lens face 22 of the second lens 20, which is the lens face opposite to the opposing lens face 21 of the second lens 20, and an inclination measuring planar plate 65 is abutted to the other end face of the spacer ring 71.
  • the spacer ring 71 is adjusted such that the inclination of the reference face becomes 0 using an autocollimator 90.
  • the end faces of the spacer ring 71 are parallel to each other, and orthogonal to the rotation axis thereof. Further, the other end face of the inclination measuring planar plate 65 contacting with the end face of the spacer ring 71 is parallel to the planar face 65H, which is one of the faces of the inclination measuring planar plate 65.
  • the inclination measuring planar plate 65 is removed, and a lens 81, a spacer ring 72, a lens 82, a spacer ring 73, and a lens 83 are stacked in this order.
  • the inclination of a planar face 83H which is one of the faces of the lens 83, is measured by the autocollimator 90.
  • the measured value that indicates the inclination of the planar face 83H is greater than or equal to a predetermined value
  • the dimensional accuracy of each of the stacked members is checked and corrected so that the inclination value falls below the predetermined value.
  • the lens 83 is fixed to the lens barrel 70.
  • the spacer ring 72 supports at least one of an opposing lens face 81B of the lens 81 and an opposing lens face 82A of the lens 82, opposing with each other, by an end face shaped corresponding to the shape of the opposing lens face.
  • an end face 72A of the spacer ring 72 on the side towards the opposing lens face 81B is formed as the receiving face having a shape corresponding to the shape of the opposing lens face 81B
  • an end face 72B of the spacer ring 72 on the side towards the opposing lens face 82A is formed as the receiving face having a shape corresponding to the shape of the opposing lens face 82A.
  • a lens 84, a spacer ring 74, a lens 85, a lens 86, and a measuring planar plate 66 are stacked on the lens 83 in this order.
  • the inclination value of a planar face 66H which is one of the faces of the measuring planar plate 66, is measured by the autocollimator 90.
  • the inclination value of the planar face 66H is greater than or equal to a predetermined value, the dimensional accuracy of each of the stacked members is checked and corrected so that the inclination value falls below the predetermined value.
  • the measuring planar plate 66 is removed and the lens 86 is fixed to the lens barrel 70.
  • a holding section 87J holding a lens 87 is abutted to the lens 86, and the holding section 87J is fixed to the lens barrel 70, thereby the assembly of the lens system 100 is completed.
  • the spacing between two mutually opposing lenses may be set more accurately in comparison with the conventional method, without increasing the manufacturing cost of the lens system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Automatic Assembly (AREA)

Claims (5)

  1. Linsensystem-Montageverfahren zum Zusammenbauen eines Linsensystems durch Fixieren der Positionen von zwei einander gegenüberliegenden Linsen in der Weise, dass der Abstand zwischen den beiden Linsen einem vorbestimmten Abstand entspricht, umfassend folgende Schritte:
    Bereitstellen einer Abstandslehre (50), die eine erste Aufnahmefläche (51) und eine zweite Aufnahmefläche (52) enthält, die auf derselben Seite der Abstandslehre ausgebildet sind, von denen die erste Aufnahmefläche (51) eine konkav-konvexe Form komplementär zu der gegenüberliegenden Linsenfläche (12) einer ersten Linse (10) besitzt, bei der es sich um eine der beiden Linsen handelt, und die zweite Aufnahmefläche (52) ringförmig ist und eine konkav-konvexe Form der gegenüberliegenden Linsenfläche (21) einer zweiten Linse (20) in einer entsprechenden Ringzone aufweist, wobei es sich um die andere Linse der beiden Linsen handelt, wobei die ersten Aufnahmefläche (51) und die zweite Aufnahmefläche (52) koaxial angeordnet und axial voneinander um eine vorbestimmte Distanz beabstandet sind, und eines Linsenhalteelements (60), welches in der Lage ist, die erste Linse (10) zu halten, ohne die erste Linse (10) durchsetzendes Licht zu blockieren, wobei das Linsenhalteelement (60) eine Linsenaufnahmefläche (61) mit einer konkav-konvexen Form komplementär zu der gegenüberliegenden Linsenfläche (21) der zweiten Linse (20) enthält;
    Halten der ersten Linse (10) mit dem Linsenhalteelement (60), während die gegenüberliegende Linsenfläche (12) der ersten Linse (10) in enge Berührung mit der ersten Aufnahmefläche (51) der Abstandslehre (50) gehalten wird, und die Linsenaufnahmefläche (61) des Linsenhalteelements (60) in enge Berührung mit der zweiten Aufnahmefläche (52) der Abstandslehre (50) gebracht wird, um dadurch die erste Linse (10) axial auszurichten;
    Entfernen der Abstandslehre (50) von der ersten Linse (10) und von dem die erste Linse (11) haltenden Linsenhalteelement (60); und
    Anlegen der zweiten Linse (20) an die Linsenaufnahmefläche (61) des Linsenhalteelements (60) derart, dass die gegenüberliegende Linsenfläche (21) der zweiten Linse (20) in enge Berührung mit der Linsenaufnahmefläche (61) gebracht wird.
  2. Set, umfassend ein Linsenhalteelement (60) und eine Abstandslehre (50) zur Verwendung bei einem Linsensystem-Montageverfahren nach Anspruch 1, bei dem die Abstandslehre (50) eine erste Aufnahmefläche (51) und eine zweite Aufnahmefläche (52) aufweist, die auf derselben Seite der Abstandslehre gebildet sind, von denen die erste Aufnahmefläche (51) eine konkav-konvexe Form komplementär zu der gegenüberliegenden Linsenfläche (12) einer ersten Linse (10) aufweist und dazu ausgebildet ist, die erste Linse (10) auf deren optischer Achse aufzunehmen, welche die eine der beiden Linsen ist, und die zweite Aufnahmefläche (52) ringförmig ist und die konkav-konvexe Form der gegenüberliegenden Linsenfläche (21) einer zweiten Linse (11) in einer entsprechenden Ringzone aufweist, welche die andere Linse der beiden Linsen ist, die erste Aufnahmefläche (51) und die zweite Aufnahmefläche (52) koaxial angeordnet und axial um den vorbestimmten Abstand beabstandet sind.
  3. Set nach Anspruch 2, dadurch gekennzeichnet, dass die Mittelachse der Abstandslehre (50) durch die Kugelmitte der ersten Aufnahmefläche (51) und die Kugelmitte der zweiten Aufnahmefläche (52) verläuft.
  4. Set nach Anspruch 2, dadurch gekennzeichnet, dass die Mittelachse der Abstandslehre (50) der Mittelachse der ersten Aufnahmefläche (51) und der Mittelachse der zweiten Aufnahmefläche (52) entspricht.
  5. Set nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die Krümmung der ersten Aufnahmefläche (51) kleiner als die Krümmung der zweiten Aufnahmefläche (52) ist.
EP07008425A 2006-04-27 2007-04-25 Verfahren zur Montage eines Linsensystems mittels Abstandsvorrichtung Not-in-force EP1850161B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006123778A JP4823755B2 (ja) 2006-04-27 2006-04-27 レンズシステム組立方法および間隔設定冶具

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EP1850161A1 EP1850161A1 (de) 2007-10-31
EP1850161B1 true EP1850161B1 (de) 2012-01-25

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EP (1) EP1850161B1 (de)
JP (1) JP4823755B2 (de)
AT (1) ATE543114T1 (de)

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JP2009233244A (ja) * 2008-03-28 2009-10-15 Fujinon Corp プローブ用光学ユニット及びその組み立て方法
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CA3094041A1 (en) * 2018-03-19 2019-09-26 Masakazu Kawada Space ring, lens system, method for manufacturing space ring, and method for assembling lens system
CN110850547B (zh) 2018-08-21 2022-05-17 宁波舜宇光电信息有限公司 光学镜头、摄像模组及其组装方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102222390B1 (ko) 2013-04-16 2021-03-04 코닝 인코포레이티드 광학 조립체에서의 스택킹 소자 왜곡을 최소화하는 방법

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ATE543114T1 (de) 2012-02-15
US20070253077A1 (en) 2007-11-01
US7471472B2 (en) 2008-12-30
EP1850161A1 (de) 2007-10-31
JP4823755B2 (ja) 2011-11-24
JP2007298533A (ja) 2007-11-15

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